Fix nix-cache remote-builder trust: stale host key + wrong sshKey path #21

Merged

beatzaplenty merged 1 commits from worktree-fix-nix-cache-host-key into main

2026-07-20 17:32:33 +00:00

Author	SHA1	Message	Date
beatzaplentyandClaude Sonnet 5	fd773b65da	Fix nix-cache remote-builder trust: stale host key + wrong sshKey path Check NixOS configurations / eval-hosts (pull_request) Failing after 11m12s Details variables.nix's nixCacheHostKey no longer matched nix-cache's actual SSH host key (confirmed via ssh-keyscan against the live container), so every declaratively-configured client's programs.ssh.knownHosts trusted the wrong key -- distributed builds would fail host-key verification. Also, modules/nix-cache/remote-builder-client.nix hardcoded sshKey to /root/.ssh/nixremote, but the `server` host only has its own default /root/.ssh/id_ed25519 installed (confirmed live via qm guest-agent) -- that file was never even present, so the build machine config pointed at nothing. Standardize on each client's own default identity, matching the per-host-key pattern vars.remoteBuilderAuthorizedKeys already uses instead of a shared/differently-named keypair, and add scripts/secrets/sync-nix-cache-host-key.sh (wired into codex-maintenance.sh's --check) so the host-key drift doesn't silently recur next time nix-cache is rebuilt or recreated. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01V7yVH71vGrDVzovh9UaMu8	2026-07-20 17:21:12 +00:00

Author

SHA1

Message

Date

beatzaplentyandClaude Sonnet 5

fd773b65da

Fix nix-cache remote-builder trust: stale host key + wrong sshKey path

Check NixOS configurations / eval-hosts (pull_request) Failing after 11m12s

Details

variables.nix's nixCacheHostKey no longer matched nix-cache's actual SSH
host key (confirmed via ssh-keyscan against the live container), so every
declaratively-configured client's programs.ssh.knownHosts trusted the
wrong key -- distributed builds would fail host-key verification. Also,
modules/nix-cache/remote-builder-client.nix hardcoded sshKey to
/root/.ssh/nixremote, but the `server` host only has its own default
/root/.ssh/id_ed25519 installed (confirmed live via qm guest-agent) --
that file was never even present, so the build machine config pointed at
nothing. Standardize on each client's own default identity, matching the
per-host-key pattern vars.remoteBuilderAuthorizedKeys already uses instead
of a shared/differently-named keypair, and add
scripts/secrets/sync-nix-cache-host-key.sh (wired into
codex-maintenance.sh's --check) so the host-key drift doesn't silently
recur next time nix-cache is rebuilt or recreated.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V7yVH71vGrDVzovh9UaMu8

2026-07-20 17:21:12 +00:00